Not yet. I just got back into town last night and updated the firmware. Hopefully this fixes it but I don't have high hopes. Something similar started happening with my old AirPort Extreme N, which I think was about this old. I bought the AC around launch time, and I have quite a few wireless clients in my house since I have smart home stuff and I've added a lot more in the past year. I think things like Ring cameras area always checking video in the cloud too so it's just non-stop video streams from the front and back at 1080p. It's probably taxing. If this update didn't clear things up, I might try taking it apart to see if it has too much dust buildup and is overheating. What's weird though is that I don't get disconnect messages for my Ring alarm system when it goes down, but when I do something like reboot the WiFi I get the message that it's down. It's like the WiFi is still up, but it's not connecting to the internet gateway properly. I've been wanting to replace the ISP provided modem since it's probably garbage and I've never heard of the brand and I have to pay monthly for it, but we're required to have a home phone on battery backup by the fire marshall for my wife's daycare (and it's only $10/mo through cable vs. $60/mo for traditional) and when I upgraded to 500Mbps last summer (I'm waiting for faster WiFi 6 mesh before moving up to 1Gbps) I couldn't find a DOCSIS 3.1 modem anywhere that has digital landline connections. I should probably search again as DOCSIS 3.1 has become more popular. If I can't find something, I'll probably call the cable company to see if it's on their end, which is my least favorite thing in the world to do ever.This is exactly what it is happening with mines. Did you figure out anything else?